The S&P 500 was flat in midday trading at 2,887.65.
The Dow Jones Industrial Average rose about 0.2% to 26,015.79.
The Nasdaq declined 0.3% to 7,945.41.
The yield on a 10-year Treasury bond was 0.7% lower to 2.96%.
The price of gold climbed 0.7% to $1,211.
ChromaDex Corp. (Nasdaq: CDXC) shares rallied about 14% to $4 apiece and a $219 million market cap. Shares in the Irvine-based nutritional supplements maker had dropped 20% over the least three sessions after one shareholder, who owns about 6% of the company, was named in SEC investigation. ChromaDex said it isn’t part of the inquiry.
Acacia Research Corp. (Nasdaq: ACTG) in Newport Beach was down 7% to $3.15 and a $156 million market cap. The patent licensing firm’s shares are down about 20% year-to-date.